package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.reflect.MethodSignature;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
* 自定义切面，实现公共数据填充
* */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /*
    * 切入点
    * */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointcut() {}
    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开始进行公共字段填充....");
        //获取当前被拦截方法数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); //方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); //获取方法上的注解
        OperationType operationType = autoFill.value(); //获取数据库操作类型
        //获取方法参数
        Object[] args = joinPoint.getArgs(); //获取方法参数
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];
        //准备赋值数据 时间 用户id
        LocalDateTime localDateTime = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId(); //获取当前登录用户id
        //根据操作类型赋值，通过反射赋值
        if (operationType == OperationType.INSERT) {
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射赋值
                setCreateTime.invoke(entity, localDateTime);
                setUpdateTime.invoke(entity, localDateTime);
                setCreateUser.invoke(entity, currentId);
                setUpdateUser.invoke(entity, currentId);                
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射赋值
                setUpdateTime.invoke(entity, localDateTime);
                setUpdateUser.invoke(entity, currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }            
        }
    }
}
